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In the reaction PbO (s) + C (s) → 2 Pb (s) + CO₂ (g) identify the element that is oxidized?
In the reaction PbO (s) + C (s) → 2 Pb (s) + CO₂ (g) identify the element that is reduced
What is the oxidation number of sulfur in (S₂O₈)²⁻
How many moles are in 15 grams of lithium?
The concentration of calcium in urine is approximately 5mM. What is the maximum concentration of oxalate that can be tolerated and not precipitate CaC2O4?
What is the purpose of hydrolyzing the RNA before conducting biochemical tests?
Calculate the saponification value of a fat which consumed 9ml of KOH during titration?
An oil X has a saponification Value of 100 and an Oil Y has a saponification
Value of 70. Which oil will have a high molecular weight and long fatty acid chain?
Which of the following is a primary hazard caused by an earthquake? *
tsunami
landslides
cracks on the ground/ faults
liquefaction
A fertiliser contains ammonium iron (II) sulphate, FeSO4.(NH4)2SO4.6H2O as a source of
iron.
A 6.50 g sample of this fertiliser is made up to 250 mL with dilute sulphuric acid. 25 mL of
this solution is reacted with 23.5 mL of 0.01 mol L-1 potassium dichromate (K2Cr2O7)
solution as shown by the balanced equation below
(i) Calculate the moles of Cr2O72+ ions that has reacted.
(ii) Determine the moles of Fe2+ ions that has reacted.
(iii) Calculate the mass of Fe in the 25 mL aliquot (M(Fe) = 56 g mol-1))
(iv) Determine the total mass of Fe present in the 6.50 g sample of fertiliser
(v) Calculate the percentage of Fe in the fertiliser.
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#339914 on Dec 2023